Rust, permutations between fixed size, and varying size - rust

Question

My data is structured this way:
[
(
permutation_result0,
permutation_result1,
permutation_result2,
(varying_size_values0),
(varying_size_values1),
(varying_size_values2)
)
...
]
where permutation_result0 relates to varying_size_values0 and so on...
Example:
[
(banana, apple, orange, (50, 20, 10), (66), (10, 2, 3))
(apple, beef, orange, (49), (5), (10, 20))
(cabbage, beef, apple, (30), (4, 3), (2, 1, 444))
]
Desired output:
[
(banana, apple, orange, 50, 66, 10)
(banana, apple, orange, 50, 66, 2)
(banana, apple, orange, 50, 66, 3)
(banana, apple, orange, 20, 66, 10)
(banana, apple, orange, 20, 66, 2)
...
(apple, beef, orange, 49, 5, 10)
(apple, beef, orange, 49, 5, 20)
(cabbage, beef, apple, 30, 4, 2)
(cabbage, beef, apple, 30, 4, 1)
...
]
or even:
[
(50, 66, 10)
(50, 66, 2)
...
(49, 5, 10)
(49, 5, 20)
...
(30, 4, 2)
(30, 4, 1)
...
]
The first 3 entries and their values have to stay the same until all the values that can differ in their corresponding varying values, are exhausted.
The best idea I can come up with so far is using contains:
let mut results_vec = vec![];
for i in data_structure{
let mut operating_vec = vec![];
operating_vec.push(
i.0, i.1, i.2,
(i.3, i.3.len()),
(i.4, i.4.len()),
(i.5, i.5.len())
);
let mut inside_value_vec = vec![];
let mut permutations_vec = vec![];
for i in operating_vec{
// 1. if all len > 1
if i.3.1>1 && i.4.1>1 && i.5.1>1 {
for xxx in i.3.0{
inside_value_vec.push(xxx);
};
for xxxx in i.4.0{
inside_value_vec.push(xxxx);
};
for xxxxx in i.5.0{
inside_value_vec.push(xxxxx);
};
for x in inside_value_vec.iter().permutations(3){
if i.3.0.contains(x.0)&&
i.4.0.contains(x.1)&&
i.5.0.contains(x.2){
results_vec.push(
i.0, i.1, i.2,
x.0, x.1, x.2
);
}
};
// 2.check if & which values' len == 1
//problem is I can't do it 1 by 1, I have to check all 3 values for that condition
//then remember which positions were len = 1 and glue the derived permutations' values accordingly.
// 3. else continue ( for 0 len values )
};
};
};
As per the comments in my code I can't figure out any remotely clean way for the len == 1 conditionals. I hope this problem is at least somewhat interesting to the reader and that I can receive guidance. Thanks.